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03-UnrealEngine/性能优化/UE5优化方法与实践笔记.md

@@ -7,8 +7,11 @@ rating: ⭐⭐
 ---
 
 ## 前言
-视频推荐：https://www.youtube.com/watch?v=ZRaeiVAM4LI
+- 视频推荐：
-其他：https://zhuanlan.zhihu.com/p/629225258
+	- https://www.youtube.com/watch?v=ZRaeiVAM4LI
+- 其他：
+	- https://zhuanlan.zhihu.com/p/629225258
+	- Tomlooman的优化建议:https://www.tomlooman.com/wp-content/uploads/2022/11/Unreal-Engine-Game-Optimization-on-a-Budget.pdf
 
 GPU Visualizer工具显示命令： **ProfileGPU**
 CPU优化方法:https://www.unrealengine.com/en-US/blog/how-to-improve-game-thread-cpu-performance
@@ -23,6 +26,13 @@ CPU优化方法:https://www.unrealengine.com/en-US/blog/how-to-improve-game-thre
     - we see that it is being called 10 times a frame
 4. We then need to go look at who is calling AddLight via a break point. And see why adding a specific light or lights is so slow. Usually it is the case that a specific light being added in a way that is doing more work than actually needs to be done. (e.g. attaching / reattaching it)
 
+# 优化前需做
+- r.vsync 0 
+- t.maxfps 0
+- SmoothFrameRate=False (Project Settings)
+- Lighting Built & MapCheck Errors fixed. 
+- Packaged Game build 
+	- 使用Standalone进行优化。
 ## 优化笔记
 r.Lumen.DiffuseIndirect.MeshSDF.RadiusThreshold
 让物体包围球的半径大于上述两个决定的数值的时候，才参与mesh sdf的软追踪。
@@ -212,3 +222,54 @@ UE5使用DLSS时需要关闭TAA，并且调整[[ScreenPercentage与描边宽度
 # 内存数据查看
 - stat llm：查看**虚拟内存数据**。需要在启动方式里添加`-llm`才会有数据。
 - MemoryInsight：需要在启动方式里添加`-trace=memory`，之后才能在UnrealInsight中查看。
+
+# 材质优化 MIN/MAX DRAW DISTANCE 
+使用DistanceCullFade节点将过远的部分给Cull掉。
+![[Unreal-Engine-Game-Optimization-on-a-Budget_MINMAX DRAW DISTANCE.png]]
+
+# FREEZERENDERING
+冻结渲染以此查看剔除情况。
+- ‘FreezeRendering’ + ; (semi-colon) to fly with DebugCamera 
+- Verify occlusion is working as expected
+- ‘pause’ (Freeze Game Thread)
+
+# LIGHT CULLING (Stationary & Movable) 
+- Automatic ScreenSize culling not strict enough 
+	- MinScreenRadiusForLights (0.03) 
+-  Cull earlier case-by-case 
+	-  MaxDrawDistance 
+	-  MaxDistanceFadeRange 
+-  Profiling 
+	-  Show > LightComplexity (Alt+7) 
+	-  Show > StationaryLightOverlap 
+	-  ToggleLight
+
+# LEVEL STREAMING 
+关卡流调试方法
+- Streaming Volumes vs. Manual Load/Unload 
+	- Camera Location based (caution: third person view and cinematic shots) 
+	- Cannot combine both on a specific sublevel, can mix within the game 
+- Profiling 
+	- stat levels 
+	- Loadtimes.dumpreport (+ loadtimes.reset) 
+	- Unreal Insight
+		- UnrealInsight相关标签：Look for level load & “GC” bookmarks
+		- UnrealInsight相关追踪内容：loadtime,file categories
+
+# Animation
+## ANIMATION: FAST PATH 
+- Allow ‘Fast Path’ by moving Computations out of AnimGraph (into EventGraph) 
+	- Use WarnAboutBlueprintUsage to get warnings in AnimGraph 
+- Profiling 
+	- stat anim
+
+## ANIMATION: QUICK WINS 
+- **Update Rate Optimization (URO) for distant SkelMeshes**：根据距离调整骨骼物体的更新频率，该选项位于SkeletalMeshComponent。
+- VisibilityBasedAnimTickOption (DefaultEngine.ini) 
+	- OnlyTickPoseWhenRendered
+	- AlwaysTickPoseAndRefreshBones 
+	- … 
+- More Bools!
+	- bRenderAsStatic ：UE5.2不存在该选项。
+	- bPauseAnims：该选项位于SkeletalMeshComponent。
+	- bNoSkeletonUpdate：该选项位于SkeletalMeshComponent。

03-UnrealEngine/性能优化/UnrealInsight以及其他性能监测工具.md

@@ -165,7 +165,11 @@ Game Thread 造成的开销，基本可以归因于 C++ 和蓝图的逻辑处理
 针对Tick可使用：
 -   **stat game**：显示 Tick 的耗时情况
 -   **dumpticks**：可将所有正在 _tick_ 的 _actor_ 打印到 _log_ 中
+	- dumpticks grouped
 -   **stat tickables**
+- **listtimers**
+- **stat uobjects**
+- [[#MOVING SCENE COMPONENTS]]
 
 复杂逻辑：需要借助 Unreal Frontend Profiler / Unreal Insights 等工具对游戏逻辑中开销较大的代码进行定位。
 ### LandscapeSubsystem Tick
@@ -234,6 +238,42 @@ Draw Thread 的主要开销来源于 **Visibility Culling** 和 **Draw Call**
 	-   对于纹理的优化，后续将另开新篇加以详细介绍
 ![](https://pic1.zhimg.com/80/v2-81aea063a7fd1de8c2eef38b355268bc_720w.jpg)
 
+## 内存
+- MEMREPORT -full
+	- Runs a number of individual commands for memory profiling
+- obj list class= 
+	- Example: obj list class=AnimSequence
+- Only in Packaged Builds 
+	- Example: AnimSequence twice as large in editor builds.
+
+这样就就可以查看指定Object的内存占用情况。
+
+## COLLISION & PHYSICS
+- Unreal configured to work out of the box. 
+	- “Collision Enabled” => Physics + Query 
+	- Most things require just ‘QueryOnly’ 
+- Disable on components players can’t reach or interact with. 
+- Profiling 
+	- stat physics, stat collision
+	- obj list class=BodySetup 
+	- show CollisionPawn, show CollisionVisibility
+- Tip: Landscape may use lower collision MIPs
+
+## MOVING SCENE COMPONENTS
+移动场景组件可能会造成一些性能问题，需要注意以下几点：
+- Move/Rotate only once per frame 
+- **Disable Collision & GenerateOverlaps=False** 
+- AutoManageAttachment 
+	- Audio & Niagara 
+- Profiling 
+	- stat component
+
+### MOVING COMPONENTS - BOUNDS
+- ***UseAttachParentBound=True***
+	- Skips “CalcBounds” 
+-  检查命令：show Bounds / showflag.bounds 1 
+
+蓝图中勾选***UseAttachParentBound***，以此跳过计算CalcBounds的问题。
 ## UnrealFrontend Profiler
 官方文档：[Profiler Tool](https://docs.unrealengine.com/4.27/zh-CN/TestingAndOptimization/PerformanceAndProfiling/Profiler/)
 其他参考文章：